[S] Change in coreboot[main]: mb/google/brya: Add romstage early graphics for nissa

[Ronak Kanabar (Code Review)]

Attention is currently required from: Eric Lai, Haribalaraman Ramasubramanian, Kapil Porwal, Nick Vaccaro, Paul Menzel, Subrata Banik, V Sowmya.

Ronak Kanabar has posted comments on this change by Ronak Kanabar. ( https://review.coreboot.org/c/coreboot/+/78932?usp=email )

Change subject: mb/google/brya: Add romstage early graphics for nissa
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Patch Set 7:

(1 comment)

File src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/78932/comment/bc6eb522_e7e8d9be?usp... :
PS7, Line 178: 		#+-----------------------------+---------------------------------------+-----+
> don't we allow T8 override […]

currently i915_gpu_panel_config we dose not have member to override T8. this we need to add for all.